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    <title>7.利用函数封装判断闰年</title>
    <script>
        // 输入一个年份，判断是否是闰年（能被4整除并且不能被100整除，或者能被400整除）
        function isRunYear(year) {
            // 如果是闰年返回 trun 否则 返回false
            var flag = false;
            if (year % 4 == 0 && year % 100 != 0 || year % 400 == 0) {
                flag = true;
            }
            return flag;
        }
        console.log(isRunYear(2000));
        console.log(isRunYear(1999));
    </script>
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